Add more lookups and transforms.
Add more lookups and transforms.

Based on others done by Marc Tamlyn work on django development branch
with some changes for make them compatible with own array field version.

Natgeoed/djorm-ext-pgarray,natgeo/djorm-ext-pgarray,niwinz/djorm-pgarray,natgeo/djorm-ext-pgarray,Natgeoed/djorm-ext-pgarray,niwinz/djorm-pgarray